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From "gleader (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-2605) queryparser parses on whitespace
Date Fri, 16 Sep 2011 10:19:08 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105979#comment-13105979
] 

gleader commented on LUCENE-2605:
---------------------------------

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> queryparser parses on whitespace
> --------------------------------
>
>                 Key: LUCENE-2605
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2605
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/queryparser
>            Reporter: Robert Muir
>             Fix For: 4.0
>
>
> The queryparser parses input on whitespace, and sends each whitespace separated term
to its own independent token stream.
> This breaks the following at query-time, because they can't see across whitespace boundaries:
> * n-gram analysis
> * shingles 
> * synonyms (especially multi-word for whitespace-separated languages)
> * languages where a 'word' can contain whitespace (e.g. vietnamese)
> Its also rather unexpected, as users think their charfilters/tokenizers/tokenfilters
will do the same thing at index and querytime, but
> in many cases they can't. Instead, preferably the queryparser would parse around only
real 'operators'.

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